Here are some important court cases that address religion in the public schools (OBVIOUSLY WE CANNOT COVER THEM ALL BUT WE SHOULD TRY TO IDENTIFY THE MOST SIGNIFICANT ONES):

Current Status of Establishment Tests
Lemon v. Kurtzman, 1971
Lynch v. Donnelly, 1984
County of Allegheny v. American Civil Liberties Union Greater Pittsburg Chapter, 1989
Lee v. Weisman, 1992
Lamb's Chapel v. Center Moriches Union Free School District, 1993
Rosenberger v. Rector and Visitors of Univ. of Va., 1995
Bauchman v. West High School, 1997
Cutter v. Wilkinson, 2005
Van Orden v. Perry, 2005
McCreary County, Ky. v. ACLU of Ky., 2005

Prayer, Worship and Ceremonial Deism
Marsh v. Chambers, 1983
Wallace v. Jaffree, 1985
Coles v. Cleveland Board of Education, 1999
Santa Fe Independent School District v. Doe, 2000
Cole v.Oroville Union High School Dist., 2000
Chandler v. Siegelman, 2000
Adler v. Duval County School Board, 2001
Doe v. School Board of Ouachita Parish, 2001
Brown v. Gilmore, 2001
Bacus v. Palo Verde Unified School Dist. Bd. of Educ., 2002
Skarin v. Woodbine Community School District, 2002
Lassonde v. Pleasanton Unified School Dist., 2003
Holloman ex rel Holloman v. Harland, 2004
Elk Grove Unified School Dist. v. Newdow, 2004
Myers v. Loudoun County Public Schools, 2005
Doe v. Tangipahoa Parish School Board, 2006

Creationism/Intelligent Design (ID)
Scopes v. State, 1927
Freiler v. Tangipahoa Parish Board of Education, 1999
Kitzmiller v. Dover Area School District, 2005
Selman v. Cobb County School District, 2006

Distribution of Religious Literature
Jabr v. Rapides Parish School Board, 2001
Child Evangelism Fellowship of New Jersey v. Stafford Township School District, 2004
Rusk v. Crestview Local School District, 2004
Hills v. Scottsdale Unified School District, 2004
Doe v. South Iron R1 School District, 2006
Heinkel v. School Board of Lee County, Florida, 2006
Westside Community School Board vs. Mergens, 1990

Release Time and Religious Instruction
Illinois ex rel. McCollum v. Board of Education, 1948
Zorach v. Clauson, 1952
Pierce v. Sullivan West Central School District, 2004
Doe v. Porter, 2004

Religious and Holiday Displays
American Civil Liberties Union of New Jersey v. Schundler, 1999
McCreary County, Ky. v. ACLU of Ky., 2005
Van Orden v. Perry, 2005
Baker v. Adams County/Ohio Valley School Bd, 2005
Skoros v. City of New York, 2006
Weinbaum v. Las Cruces Public Schools, 2006